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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96c4bc386040ddd75944cf93f3adf35ca4c553654658484ded470f6add441db1' 
  AND token = 'yGunAklHlAZfRFG+c4HXj910z4N2YgndLTPJwAGOsEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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