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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a1c05fb48786d258ab9a6e4e151dce11dbf1e3e9921bf1fbd1536fbc6b86eaf' 
  AND token = 'rW6tF0gNHT9qD9Cm0Fv3GnDMy5YLgGbvXxxd8p0SoFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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