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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9af609965ecf11f8d53bfa5a28518881461cce9a9e63439d5edddb1a09f48010' 
  AND token = 'WXOySOna+k/fpU21f4NWm6PIwfho0Qiq7NK6+b5twhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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