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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6355d83016654deffc942b276b5324e66ac87a82eaba35c3836f9aa6ee8de8e5' 
  AND token = '1Wrxer0CXvbME0p2O/cvG7c5elZvyqMJ3WB4NllKMm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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