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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f468c8b2cb8e46481dc7f67c0b29d98c000fcc0a5860f7252447eff8f5059592' 
  AND token = 'Ct8VYNEuJxp05mPl2ns7pkvt3feS34VCVGrU/sNH2ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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