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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b30cea12e1a328c1fa747b8bc6729797a616f37fbc8845b3e10e780439f03a7b' 
  AND token = 'nloXSvcFp2LqJ353IaJwNFTBiGkqxQqte+hm5O0OZto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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