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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f2f439bd09c886eda0a6176a3bd8174a338f1c1e1f8b21ec4d88857d0a0d58' 
  AND token = 'qQ3yOoFv00EndHbxayK8BnDZsAsTnEDik/oApx1/6UM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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