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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e2bf2b2be39f5264351248d214081bc8b8ec08555fc7128d0aeca4f9b96270b' 
  AND token = 'lRO8n9f9DHqJBhi6zhjbRJiXIAIscNaAWDIUq7Vvlb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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