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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d0b8768d27434c60dc05b356adf078879f505b9a8afac165d70837f30b79f4c' 
  AND token = 'r+yjWAZFankbRZSwi4w6Bg6AGiU2pVMY7pe9LQubTfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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