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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ae7b4674f2d7ab9d4ad149579cec80ad51df5259e3728a53a5498ccb16aa9a1' 
  AND token = 'wEeWfxn2ke0FNZ1A08EiXuGoH0Nxc4ikuo5ilXs91OQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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