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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03976aea8c24be697efb847a9c559de6bd11c5154d43dacb625da1d2d8b4cf8d' 
  AND token = '2nf2ubA6YpcGJqO7ZYDdzI8GHKq4JYaP52t/6PPDxPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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