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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fc17e10db366a64163ff0f20745ae80d058c265920a2cea68a28ec566b98770' 
  AND token = 'rNJF2xCmk+i3su2h9WYopmd/FVJp113HU/c+Cc3t6F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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