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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9612c72be18bee25283b7b1f786b4619aa4b87291666616cad2530cfd021e96f' 
  AND token = 'ak6+IJDxYXYnPG6X18gYNHBIGu/Vvi0Nw1dAvkERq5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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