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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa5fed2a7004ca1d450894981b392a420e7f7ff9d857d8b2fb99f6b83c3be232' 
  AND token = 'xYwCpAZsdgywp6gKAj3Xnor0+TE4ifATiOprewbglns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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