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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c06a570165b8248a558fbfb4f6fb1859e0b8cbcf7228b740950f74ec58781e57' 
  AND token = '/ejc7nj52eGQaLl7UWc3FyoxS7CJ9x4W/lBGYX1ircY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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