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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87ac5bece7759387214990d384c30671a93ea93589ee160f950a5e3b9a15fe1f' 
  AND token = 'VUSZ8fqnY2Ofmn+dmFEJee59EDbJCH+VvyShmZ8N2I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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