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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb16112072d4cf88f66140f2b8a310449974e1501bc90bbb2dd040e90898647e' 
  AND token = 'xM8+GlqcVT8w9FzbKzlWZmGTAxNNWqnkgrH5cMXr0Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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