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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faab4c9737023045710aa0987f86847079e9ec674f460bc9d60070f3756f8a59' 
  AND token = 'hsbhrRHubMjyHfdSyWxCu1Qb0+K674gTdur85gmiHIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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