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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a2cbcf2f92de202ddfb9d38ce039ccb9b4c7beb2ce0ab1bad9610b0c6c2a49b' 
  AND token = 'iGtDc+spRLcgL0/Ii4CQdRtSw+YCbUs727SI1c+hxX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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