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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88175380d42b90d5187aef412fffbe938e588bb3da2fb115a0f431b32aa20405' 
  AND token = 'ktVHybP1gM+5FOLIALt22tPv21zRNdEP4O9C+4fGpJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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