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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '978dffd960359ffca07e70f02c1d8a2b4a200f0a9b7aa7769e6eb70fd7232983' 
  AND token = 'C3SpNBmoDU7wNCcBsBMuyVxSRp4s2kv8NurvedX08VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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