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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd465500e7bd0bdc5897c27b96cb9e3c298f9fbc886c92149ce24d0400828ee6a' 
  AND token = '990zKBesgMLsWsw4FykfKkL2Q0bDPBe18U7xOhbuZh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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