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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd28e302348d88370bda3f6b840be1cfc7f3c7b096362f9a1105cc404a304379' 
  AND token = 'RaZ8He9PLgcq2Kz9bpTMVCCM8Xa7zHxMAbXGkTecYfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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