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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a68a4f3a88ff7aa118cbac17ab2a5de8655d4b4c1eddbe83f6d0eef56301862' 
  AND token = 'KYHvmPc1BL06Xf5ewynnZl8pr1t1+TjK1lSBkRZZtsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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