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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8caa843f3bea51248dfdc6db7de6197ee663086bb4c8e6c5b6f6c85d683e13b' 
  AND token = 'H2X/5cxbUfU/GslOEilrJf71yLNvxeu3ZO58xjl760k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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