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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b578c11b71eaf3ac369f8f56f4357d9d09ebff89e5cca8ff85a8fbe9dd6b6a32' 
  AND token = '1nfiP/LOvczt7UnlrVSvWNflFpK+0HUpV0oh2LsAkWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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