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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '371b585fa6f8f6df7a2870dbcf4c790ff321856d025ee238778d859a9ecb957e' 
  AND token = 'M2VVcSO9pGee5rbgtdm38jug3eSQPmQqqFHf1MdDsEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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