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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd6c7e1ef646961ab1591b1b59b81af7e67267870ba7fe90faef05ef59936c97' 
  AND token = 'lJRldh+ARVw68YjS03+rYv6Mt6HnQIN37xv8bQdHu7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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