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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fa554c98d09df6856d24a0955b354a5252ffdcdcf0b17f985b401e105f56b1c' 
  AND token = 'CHq+uiCl/yX/PVD9d0TLkZbQ7CTb1DFvibYr+TrcC5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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