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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91f8b9ab782f990f0f447b0c8b9d94b067a5f01ed64ba85894a8c17ad16f9d8c' 
  AND token = '7ABv2XB77T8qEYL6bb5GBE3iU67KNazhHYgh3Czmvf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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