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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2e70665c0a15d6b4183d5f4e71b4d97cb2abc57b9ded7e9c442bc46eda2ce5d' 
  AND token = 'hCbqB8/PSwr/hgj4sJbe/DrFRCiR1SX9/GDc+j1N0HY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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