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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ec77080c8d583901f41113dc19ae89b23d654fcbde01f69373e7cf80a6e7607' 
  AND token = 'dw/Wo1/ZYJZyjDuz8b95ccvjAsBxNiB/5l2j+JeALCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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