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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d8f967cfc5aa84a582583b8787d6fb8e006530be1d6e9162aac7ff73728cdbd' 
  AND token = 'rZ2BHX+30Pz0mFwrvxvWptMCMWspjAoDT+Civ9cgBcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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