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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74167241dfdb4349f337b9d8f174293ebafac5b62015282eb2f59a2642d7d5f8' 
  AND token = '9b2s4YherFMQgIcCu25DIglOZIqoXe86X86g4aWdFPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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