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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '870e466601909991358e6bbdbe2fe74a2f11919ec0ea3aa810c6794ced045950' 
  AND token = 'OROchBAlKpAZonthKtnTW6SE0Xvw9+8Rg/9/v+UPRhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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