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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97af6cb0f4080c8281d680d4dde7582f79398499986c07be7b6736924422f3c4' 
  AND token = 'U6W6bZB6dKo2s9e+TVACIrOvunrDWGMcpkxjUDQjcwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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