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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be0ca695828cdf2b3ace22ed139733c27a2450511f641bc3a6d2ed875b09f8c1' 
  AND token = 'u90nt0IVUj6DFMmXJE1ZrG/PZnXYrPmLDFVRsLyE/ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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