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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a9d2892d27a36718e5e1d24e8a58c388540bc1f796b42a21ea12a5625e73893' 
  AND token = '0h26mGfCeVOKWNb1/o+wwM+NcVWax+P5ex2O+8UY2Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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