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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '105669e888394c2878f6bd66ae4cecd71375ed2cebbb3410878cc1aba74d0366' 
  AND token = '5Gvs4zDRj+RzGbMimRVmzoQ4kPNIn6wG3r1iRiAn58I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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