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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24bc217cdc73fe43ec0097cbf3927ed4d632bf11e3594a0f77bdf4c26dc4dc76' 
  AND token = 'p47o7F+jqR10b3yGfhE3L7k0I10jIY2i2pbSR0Jg5ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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