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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '978ac2c7ace68380b19ae2e7b3cb86c317fbc907c3c7a80b4bcd5b11a1a9d1ca' 
  AND token = 'ytW9yjtdthHjerZFyoNPg56fUb4vyfvpyOsAG53xBuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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