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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5926fbbe59c5d76302232ab28d7961c7ccadae64edc43bc77fb34e9dc2c14fc3' 
  AND token = 'M+BDbDvhTWZNL/vLuniZAd15cl2lQFtll3Fo7ti9c/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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