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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8787ef3b655fdbc1f46b993d18328ac5ba071035b82338949c1ad83a767c91d2' 
  AND token = 'EyZPCz4deZm+fukNQB/UaADfW9Na3kfpIFvzUn21cw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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