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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee3ed8a4d6cfb5d8aeea72e9091fcc3d7ff4691b847e8757c22eb354c3306b7' 
  AND token = 'ohcIBlGInro8PKVOw5TH04vFv3ZT9T0FQA6Mo3Lw7OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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