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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b03cfb41fc3f887131373da001c28df1dddb0eec69a026133afc32b0636ebd' 
  AND token = 'Zg0aah/Zr3RPhe6hp2Aq0hoQcgsEoRV8WiQxQzjH63I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00143

JSON explain

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