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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0db4b53ea376eea437a2c651c544980ff55f4a49328f25e0e2151e53f70c49f5' 
  AND token = 'ZAQPZhwOyfxwDchx3zBOiv85Dib//5p70x6DaCqf5Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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