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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '693c4367ec493643a504814e8b7e4ea8afae5912e3d3c9eaa4040504d3ae0ace' 
  AND token = 'aucVeozXBexYuJbKUJVHkikiU1hGvjGijLf6Y3fbQfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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