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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c73f9e837dc0ab908b0fdafab89b2753d6a31fbe16f4dde23a1410ba4598834e' 
  AND token = 'DBPssP36+zS0lHE2OtgzPVbIdh6BDMGLx+7/RDu0k3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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