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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd15d25f083e5d5470def43222085c0199b26d57831b04f84ca4c7fb2c2cde4d0' 
  AND token = 'kVk5LgI1JNF0QkL8pYrpXryY2M0bpyeWvG+nqft7z5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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