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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7dab9571ee814f3899c4aad51e9cb5e5b826bd825523a9272a17b6240fde07b' 
  AND token = 'OqZwNAsvCaP/agky4lGIfeTEAI64f7ppwP6wlpTdcg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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