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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c34cbf33fbdd12b9b9b1064c9673a3540ca0fd522544ac4b1ead8a8af209f7a4' 
  AND token = '9by/S8CeK34J9qPRtPUa9wm77SK4cvryy+i3RLikg28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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