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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db5bbc8ae4fd60c1121bf4e9f4d31174989ca5e2c00562ccf57a13e2fc2494e4' 
  AND token = 'tVxhUUrer4/6UWxGV9k7Sl6j1Gk2w19a9Ei/TbjhXVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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