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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c0fbff70ea96d39b30d65990325700e41f3a781ba915cd5b15b1a73aa2634ce' 
  AND token = 'j+1ifGUe8Hp4bNOwQ1S9SiudhXWYcV7+vdvHDEoqExY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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