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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd174b9529caa10a96d3af1bee07b2d2cf4f84747dffbb53b8328c704a1909f1c' 
  AND token = 'T4HpTAajwwaS41U06+8GgHHI5nMCF0G15yuKhs5znfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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