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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73fd356b6f858dc78e012dbef82c94add1a530951c20bc188d96455aa8837f0a' 
  AND token = 'ZXe4DnMdaGotxaI0mDv/sBmGnPpu7X8xx8yEHJoXobI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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