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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37f88a428dba9229276e6b1f56f83eeb7fb10d2c4eabdf5a1e593df974cb8b4d' 
  AND token = 'GIWCY45FkthkW9ozNGbr5FE54dTY+5Ouf1urrgDb/CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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