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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea2e531696b93d896e281ee3a51c5579c1397aa730ac7d37a0ad92cd2132c08' 
  AND token = 'ciOEXMnSL//NKBa9mRaBRLFJT73v31EZBBq1lGrDzSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}